<template> 
     <button class="g-button" :class="{[`icon-${iconPosition}`]: true}"
     @click="$emit('click')">
            <g-icon class="icon" v-if="icon && !loading" :name="icon"></g-icon>
            <g-icon class="loading icon" v-if="loading" name="loading"></g-icon>
            <div class="content">
                <slot></slot>
            </div>
     </button>
</template>

<script>
import Icon from './icon'
export default {
      name:'GuluButton',
       components:{
           'g-icon': Icon
       },
        props:{
            icon: {},
            loading:{
                type: Boolean,
                default: false
            },
            iconPosition:{
                type: String,
                default: 'left',
                validator(value){
                   return value === 'left' || value === 'right'
                }
            }
        }
}
</script>
<style lang="scss" scoped>
$font-size:14px;
$button-height:32px;
$button-bg: white;
$button-active-bg: #eee;
$border-radius: 4px;
$color: #333;
$border-color: #999;
$border-color-hover: #666;
@keyframes spin{
    0%{ transform: rotate(0deg); }
    100%{ transform: rotate(360deg); }
}

 .g-button{
    font-size: $font-size;height: $button-height;padding: 0 1em;
    border-radius: $border-radius; border: 1px solid $border-color;
    background: $button-bg;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    vertical-align: middle;

    &:hover{border-color: $border-color-hover;}
    &:active{background-color: $button-active-bg;}
    &:focus{outline: none;}
     > .content{ order: 2; }
     > .icon{ order:1; margin-right: .4em; }
    &.icon-right{
        > .content{order: 1;}
        > .icon{order: 2; margin-right: 0; margin-left: .4em;}
     }
     .loading{animation: spin 2s infinite linear;}
    }
</style>